Illinois Department of Transportation Hanley Building 2300 S. Dirksen Parkway Springfield, IL 62764 (217) 782-7820 or TTY (866) 273-3681, Discover, analyze and download data from Illinois Department of Transportation. Download in CSV, KML, Zip, GeoJSON, GeoTIFF or PNG. Find API links for GeoServices, WMS, and WFS. Analyze with charts and thematic maps. Take the next step and create StoryMaps and Web Maps., IDOT has responsibility for the planning, construction, operation, and maintenance of Illinois' extensive transportation network, which encompasses and bridges, airports, public transit, rail freight, and rail passenger systems. Transportation impacts every community, big or small., Our mission is to provide safe, cost-effective transportation for Illinois’ residents and visitors in ways that enhance quality of life, promote economic prosperity and demonstrate respect for the environment., In this section of the website we provide information about IDOT, including a brief overview of the department, our history and governance, as well as our performance across our day-to-day operations and initiatives, employment opportunities, and our regional presence throughout the state., Welcome to Illinois Department of Transportation Bridge Information website. Our goal is to offer bridge inspection and inventory information to the public. Informational notes: You can locate bridges by County, Interstates, U.S. Highways, IL Highways, address, and structure number..